Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Defender of Autocanno (50 points)	Using Autocannon 300 times
Every little helps (100 points)	Collect 2,000,000 Gold
Expeller of Aliens (50 points)	Kill 3,000 Megascarab(s)
Fearless (50 points)	Kill 6,000 Aliens
Heavy Tank (50 points)	Use Machine Gun for 300 times
Killer of Alien (50 points)	Kill 3,000 Explorer(s)
Machine Breaker (50 points)	Use Machine Gun for 300 times
Master of clearing Stage (100 points)	Clear Stage 3-7
Master of Collection (50 points)	Obtain 6 weapons
Millionare (200 points)	Collect 3,200 Energy
Shadow of Death (50 points)	Kill 2,000 Elite(s)
Star Picker (100 points)	Collect 63 Stars
Zombie Killer (50 points)	Kill 4,500 Stinger(s)
Zombie Nightmare (50 points)	Kill 2,400 Smasher(s)